(Thompson, 1946) Polydiexodinidae Middle Permian unknown Loeblich and Tappan identified by scientist 1 / FEU-1014632 | Dunbar and Skinner, 1931 Polydiexodinidae Middle Permian American South unknown Loeblich and Tappan identified by scientist 2 / FEU-1014633 | Dunbar and Skinner, 1931 Polydiexodinidae Middle Permian American South unknown Loeblich and Tappan identified by scientist 3 / FEU-1014645 | Dunbar and Skinner, 1937 Polydiexodinidae Lower Permian American South unknown Loeblich and Tappan identified by scientist 4 / FEU-1014646 | (Leven & Grabchak, 1986) Polydiexodinidae type specimen holotype 5 / FEU-1024130 | |||||